I have been using LocalSend (https://localsend.org) between macOS, Windows, and Linux. It works great. It has Android and iOS clients as well but I haven't tried on mobile yet.
Considering the companies they are talking about here, wouldn't it just be better to work towards a more goal driven work agreement? Show up, do what is required and then the time is yours?
If you're being paid regardless then what does it matter if you're "on the bench" for a few hours or you leave early for the day? A lot, if we're talking about employee morale. Not much if someone is sitting at their desk trying to find stuff to do.
So long as there is effective communication (which I know can be a challenge) then it really doesn't (or shouldn't) matter when a person is working if the gets done. No?
40h (or 32h) work weeks make even less sense when you work remotely.
It'd be great if, rather than just sending an email to a somewhat confusing calculator or pricing sheet, they'd show the potential cost increases alongside your actual bill so that you have 6 months to tweak, negotiate or move off the service if you really can't afford the price increases.
I don't get why it's not just "easier" to make the effects super obvious. If people are going to leave, they're going to leave.